Decomposition of Metham Sodium to Methylisothiocyanate as Affected by Wood Species, Temperature, and Moisture Content
Keywords:Fumigants, metham sodium, decomposition, wood chemistry, methylisothiocyanate
AbstractThe effect of various wood characteristics on decomposition of metham sodium to methylisothio-cyanate in sixteen North American and Southeast Asian hardwoods and softwoods was investigated. While marked differences were noted in the degree of decomposition among some species, the relationship between decomposition and lignin content, extractive levels, wood pH, or 1% alkali solubility was slight within the various species. Wood moisture content had the greatest influence on decomposition, while temperature had a lesser effect. The results suggest that the wood environment could be manipulated to enhance metham sodium decomposition, thereby allowing dosage to be reduced or the period between applications to be prolonged.
American Society For Testing and Materials. 1991a. Standard test method for 1% sodium hydroxide solubility. D-1109-84. Annual book of standards, vol. 4.09: Wood. ASTM, Philadelphia, PA.nAmerican Society For Testing and Materials. 1991b. Standard test method for alcohol-benzene solubility of wood. D-1107-84. Annual book of standards, vol. 4.09: Wood. ASTM, Philadelphia, PA.nAmerican Society For Testing and Materials. 1991c. Standard test method for acid-insoluble lignin in wood. D-1106-84. Annual book of standards, vol. 4.09: Wood. ASTM, Philadelphia, PA.nFarmer, R. H. 1967. Chemistry in the utilization of wood. Pergamon Press, New York, NY. Pp. 94-95.nHelsing, G. G., J. Morrell, and R. D. Graham. 1984. Evaluations of fumigants for control of internal decay in pressure-treated Douglas-fir poles and piles. Holz-forschung 38:277-280.nLebow, S. T., and J. J. Morrell. 1993. Methylisothio-cyanate fumigant content of Douglas-fir heartwood at various moisture levels after treatment with solid sodium n-methyldithiocarbamate in Douglas-fir heart-wood. Wood Fiber Sci. 25(1):87-90.nMiller, D. B., and J. J. Morrell. 1990. Interactions between sodium n-methyldithiocarbamate and Douglas-fir heartwood. Wood Fiber Sci. 22(2):135-141.nMorrell, J. J., and M. E. Corden. 1986. Controlling wood deterioration with fumigants: A review. Forest Prod. J. 36(10):26-34.nMorrell, J. J., C. M. Sexton, and M. A. Newbill. 1992. Fumigant treatment of wood species used for railroad ties: A preliminary examination. Forest Prod. J. 42(1):58-61.nSexton, C. M., J. J. Morrell, and M. A. Newbill. 1991. Controlling decay fungi in Douglas-fir heartwood with pelletized sodium n-methyldithiocarbamate. Wood Fiber Sci. 23(4):590-596.nTurner, N. J., and M. E. Corden. 1963. Decomposition of sodium n-methyldithiocarbamate in soil. Phytopathology 53:1388-1394.nZahora, A. R. 1983. Methylisothiocyanate as a wood fumigant: Fungitoxicity to Poria carbonica in wood and gelatin encapsulation for use in wood products. M.S. thesis, Oregon State University, Corvallis, OR. 65 pp.nZahora, A. R., and J. J. Morrell. 1989a. Diffusion and sorption of the fumigant methylisothiocyanate in Douglas-fir wood. Wood Fiber Sci. 21(1):55-66.nZahora, A. R., and J. J. Morrell. 1989b. The influence of wood moisture content on the fungitoxicity of methylisothiocyanate in Douglas-fir heartwood. Wood Fiber Sci. 21(4): 343-353.n
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.